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When using a Self-Signed Certificate which was create outside of Ignition, you will need to construct a CA Certificate chain If you do not have access to or cannot easily locate your Root CA Certificate required to be used by the MQTT Modules.The CA Certificate chain will comprise of all Intermediate CA certificates and the Root CA concatenated into a single cert file. You can download the source files required , you can download by using the Firefox browser.

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The browser will show each of the three certificates available.  Download the files from each of the Intermediate CA and Root CA tabs using Select the Root CA tab and scroll down to find the download file link. 

Construct the CA Certificate chain by concatenating these downloaded files into a single new file.

In this example, we first have the CLS Testing Intermediate CA which is the concatenated with the CLS Root CA

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